.ux-image-button {
    background: transparent none no-repeat 50% 50%;
    border: 0;
    padding: 0;
    cursor: pointer;
}

.ux-image-button-over{
    border:1px solid #dddddd;
    background: #efefef url(../resources/images/default/grid/row-over.gif) no-repeat 55% 55%;
	padding: 4px;
}